Possible bug in hooks sample code

In this section:
https://reactjs.org/docs/hooks-faq.html#how-to-read-an-often-changing-value-from-usecallback

  const handleSubmit = useEventCallback(() => {
    alert(text);
  }, [text]);

Where useEventCallback is:

function useEventCallback(fn, dependencies) {
  const ref = useRef(() => {
    throw new Error('Cannot call an event handler while rendering.');
  });

  useLayoutEffect(() => {
    ref.current = fn;
  }, [fn, ...dependencies]);

  return useCallback(() => {
    const fn = ref.current;
    return fn();
  }, [ref]);
}

Which means useLayoutEffect() is re-run each time fn changes.
Since fn in the example is re-created on each render it means that useLayoutEffect() always re-runs.
But at the same time the fn function can't be not created on each render because it depends on text which is re-defined on each render.

Start by reading the linked Hooks FAQ section and inspecting the useEventCallback example, especially its useLayoutEffect and useCallback dependencies. Confirm whether the sample behaves as documented, then update the example or its explanation so the intended behavior and completion criteria are clear.